Pentax ZX-60 ZX-60 Manual - Page 45

Advanced, Operation, Built-in, Flash

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ADVANCED OPERATION FOR THE BUILT-IN FLASH 4.Metered Manual Mode • When using the built-in flash in the Metered Manual Mode, any combination of aperture and shutter speed slower than 1/100 can be set. In this mode, the exposure of the background can be controlled by the manual exposure while the flash properly exposes the foreground subject. 1. Calculating the flash effective range according to the camerato-subject distance. Maximum flash distance = Guide Number ÷ Selected aperture Minimum flash distance = Maximum flash distance ÷ 5* MEMO • When the distance to the subject is less than 0.7m (2.3ft), the flash cannot be used. If the flash is used less than 0.7m, it causes vignetting in the picture corners, light is distributed unevenly and the picture may be over exposed. • The value 5 used in the formula above is fixed value applied to the built-in flash in this camera. The guide number (GN) depends upon the film speed used as shown below. ISO25-►GN5.5 ISO50-+GN7.8 IS0100-t-GN11 IS0200-•-GN15.6 IS0400-GN22 Exp. If an ISO100 film is used at an aperture of f/3.5, the flash effective distance is obtained as follows: For maximum distance Guide Number (11) ÷ f/3.5 = 3.14m For minimum distance 3.14 5 = 0.63m -*0.7m * Minimum distance of the built-in flash in this camera Thus, the flash effective distance is from approx. 0.7m to 3.14m. 2. Calculating the aperture according to the camera-to-subject distance Aperture = Guide Number ÷ Camera-to-subject distance Exp. If the camera-to-subject distance is 2.5m and ISO 100 film is used, the effective aperture is obtained as follows: Guide Number (11) ÷ Distance (2.5m) = f/4.4 If the calculated aperture value is different.from an indicated f stop, for instance f/4.4, select the next smaller aperture value. (Set to f/4 in this case)

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ADVANCED
OPERATION
FOR
THE
BUILT-IN
FLASH
4.Metered
Manual
Mode
•
When
using
the
built-in
flash
in
the
Metered
Manual
Mode,
any
combination
of
aperture
and
shutter
speed
slower
than
1/100
can
be
set.
In
this
mode,
the
exposure
of
the
background
can
be
controlled
by
the
manual
exposure
while
the
flash
properly
exposes
the
foreground
subject.
1.
Calculating
the
flash
effective
range
according
to
the
camera
-
to
-subject
distance.
Maximum
flash
distance
=
Guide
Number
÷
Selected
aperture
Minimum
flash
distance
=
Maximum
flash
distance
÷
5*
MEMO
•
When
the
distance
to
the
subject
is
less
than
0.7m
(2.3ft),
the
flash
cannot
be
used.
If
the
flash
is
used
less
than
0.7m,
it
causes
vignetting
in
the
picture
corners,
light
is
distributed
unevenly
and
the
picture
may
be
over
exposed.
•
The
value
5
used
in
the
formula
above
is
fixed
value
applied
to
the
built-in
flash
in
this
camera.
The
guide
number
(GN)
depends
upon
the
film
speed
used
as
shown
below.
ISO25-►GN5.5
IS0200-•-GN15.6
ISO50-+GN7.8
IS0400-GN22
IS0100-t-GN11
Exp.
If
an
ISO100
film
is
used
at
an
aperture
of
f/3.5,
the
flash
effective
distance
is
obtained
as
follows:
For
maximum
distance
Guide
Number
(11)
÷
f/3.5
=
3.14m
For
minimum
distance
3.14
5
=
0.63m
-*0.7m
*
Minimum
distance
of
the
built-in
flash
in
this
camera
Thus,
the
flash
effective
distance
is
from
approx.
0.7m
to
3.14m.
2.
Calculating
the
aperture
according
to
the
camera
-to
-subject
distance
Aperture
=
Guide
Number
÷
Camera
-to
-subject
distance
Exp.
If
the
camera
-to
-subject
distance
is
2.5m
and
ISO
100
film
is
used,
the
effective
aperture
is
obtained
as
follows:
Guide
Number
(11)
÷
Distance
(2.5m)
=
f/4.4
If
the
calculated
aperture
value
is
different.from
an
indicated
f
stop,
for
instance
f/4.4,
select
the
next
smaller
aperture
value.
(Set
to
f/4
in
this
case)